Use of jagged cutters

Abstract

Use of jagged cutters for the longitudinal cutting of double-face self-adhesive tapes with PP backing provides easy hand tearability.

Description

1. Field of the InventionThe invention relates to the use of jagged cutters for the longitudinal cutting of double-face self-adhesive tapes with polypropylene (PP) backing for the purpose of edge tearability, i.e. rendering the tapes hand-tearable transversely.The problem of edge tearability in the case of self-adhesive tapes has been present for a long time. Since adhesive tapes with plastic film backings are usually difficult to tear off by hand, use has to be made of a knife or scissors, or else the teeth if necessary.2. Description of the Prior ArtBecause of this requirement, which is so important in practice, this problem has been approached from various angles. For example, special backing films were developed, for example foamed and / or stretched, which were intended to have paper-like properties as regards their edge tearability, e.g. DE-A 3 323 018. For the high requirements in practice, however, such adhesive tapes have been found inadequate and have not been able to become...

AI Technical Summary

Benefits of technology

Therefore the object of the invention is to provide a remedy therefor, in particular to configure double-face self-adhesive tapes with PP backing to meet the high requirements of edge tearability, so that such adhesive tapes can be torn off transversely by hand without need for scissors or knives. This must not make the restrippability of the adhered tapes more difficult by, for example, undesired tearing occurring in the process.

Jagged cutters are known per se, being used, for example, in the production of plasters and similar medical products, to prevent fraying of fabric backings or wherever a product with a jagged edge is required for optical reasons. Such jagged cutters are therefore commercially available. Jagged cutters are also conventional, for example, integrated in unwinders, for the transverse cutting of adhesive tapes.

It has further been found that the loss of edge adhesiveness of the rolls cut according to the invention is significantly reduced, as a result of the reduced contact area of the rolls with one another in a roll stack. By this means, the interleave discs otherwise necessary are superfluous.

In the case of a particularly suitable PP fixing tape covered with release paper and wound into a roll, the jagged cutter advantageously applied to the already covered fixing tape, both the adhesive tape and the release paper having the same jagged cut laterally, with easy and smooth tearability by hand.

Problems solved by technology

This must not make the restrippability of the adhered tapes more difficult by, for example, undesired tearing occurring in the process.

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